The incident occurred about 9 a.m. ET Monday at Joint Base Andrews, the agency said, ahead of a planned visit by the vice president to Wisconsin.
Secret Service spokesman Anthony Guglielmi said in a statement that the agent began "displaying behavior their colleagues found distressing." The statement did not clarify what that behavior entailed.
"The agent was removed from their assignment while medical personnel were summoned," Guglielmi said. Harris was at the Naval Observatory during the incident and there "was no impact on her departure" from the base.
"The U.S. Secret Service takes the safety and health of our employees very seriously," Guglielmi said. "As this was a medical matter, we will not disclose any further details."
Harris' office did not immediately return a request for comment
The incident was first reported by the Washington Examiner.
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